Corner bracket



June 22, 1937. A, R, ANDERSON 2,084,758

CORNER BRACKET Filed Sept. 25, 1956 INVENTOR Q/od @manson 775 ma @d/EF1 MUT/m75 Patented June 22, 1937 oNrrED spares PTENT FFECE 4 Claims.

My invention is found in a corner bracket, advantageously formed of sheet metal, and adapted to afford adequate union for the ends of two square-cut strips of Wood, and thus to consti- 5 tute a corner of a frame, such, for example, as

the frame of a window or door screen. The invention further consists in the provision of pairs of complementary, right and left, brackets. A householder, having provided himself with two 1o pairs of brackets, a quantity of wooden strip of proper` size, and a few nails, may, with a saw and a hammer, even though untrained and inexpert in carpentry, easily construct a good and serviceable frame, such, for example, as has been indicated.

In the accompanying drawing, Figs. I and II are views in plan of two identical blanks of sheet metal, cut, slit, and perforated, ready for bending to constitute a pair of brackets of the invention.

Fig-s. III and IV are similar views of the two brackets, produced by the appropriate bending of the two blanks. In these gures diiference in plane is indicated by the use of dotted lines. Figs. V and VI are views in end elevation of the two brackets, viewed from the left, Figs. III and IV. In Figs. V and VI the vertically extending webs that are nearest are shown; webs in alignment with these and more remote from the observer are, for the sake of clearness of showing, omitted. Fig. VII is a fragmentary View in perspective of a frame constructed of strips of wood united at the corners by the brackets of the invention.

The identical blanks l and 2 of Figs. I and II are cut from sheet metal-ordinary 22 gauge sheet steel is exemplary. Each blank consists of a rectangular basal portion a-b-c-d, and a trapezoi'dal extension c e-f-d Dotted lines e-g and ,f-h indicate lines of ultimate bend- 40 ing. Cuts i-y and lc-Z are made from symmetrical intermediate points i and lc along the tWo edges b-c and a-d and not far distant from the corners c and d perpendicularly to the lines of bending e-g and f-h. Tongues 3 and are slit in the basal portion. These tongues remain in integral continuity with the blank along the lines of bending e-g and f-h, and extend thence oppositely toward, but not as far as, the edges b-c and a-d. The area of the blank is thus subdivided into seven regions-the medial rectangular web, 8; two rectangular anchorage Webs, 9 and lil; two tongues, 3 and 4, slit from the webs last enumerated; and two brace webs of right angled triangular shape, with one corner truncated, H and I2. These webs all are perforated with nail holes 5 suitably situated, of which it should be remarked that those in the medial rectangular web are spaced longitudinally between the ends h--g and e-f; that those in the anchorage webs and in the tongues slit from them are spaced longitudinally between the ends g-j (fz-Z) and b-i (l1-lc); and that those in the brace webs are spaced longitudinally of and adjacent to the slits i--y' and k-Z, and that in one of these webs there are two nail holes spaced along and close to the edge c-e (or d-f).

The invention is not limited in the matter of dimensions. 'Ihe following figures of a bracket serviceable for a window screen are exemplary merely-a-b=3% inches; g-b=l1/2 inches; g-e=3 inches; b-c=11/2 inches; bi=11/8 inches; i-c=% of an inch; c-e=2 inches; e-fzof an inch. The tongues 3 and d are tapering and round ended; they are of an inch wide at the base and 11A; inches long. The stock, as has been said, is 22 gauge sheet steel.

The blanks, when cut slit and perforated, are bent, and, as between the two blanks of Figs. I and II, the bending is oppositely directed. That is to say, in the bending of the blank of Fig. I the brace web il, the tongue 3, and the anchorage web l@ are bent upward, and the brace web l2, the tongue 4, and the anchorage web 9 are bent downward; while in the blank of Fig. II the bendings are the reverse of this.A All the bends are right angled. The bending is preferably done between dies, to afford accuracy in the disposition of the webs and tongues, and sharply localized bending. The shaped article may be japanned or given other desired surface coating or finish.

As seen in Fig. III, the medial web 8 extends horizontally; the brace web l2, the anchorage web l0, and the tongue 4 extend in common vertical plane, with which .the line of bending h-f is coincident, while the brace web Il, the anchorage web 9, and the tongue 3 extend in a common vertical plane with which the line of bending g-e is coincident. The parts that extend in the plane last defined are in Fig. III, so far as they are visible, distinguished by being outlined in dotted lines. The corresponding parts of Fig. IV will readily be identified. As viewed in Fig. V, from the medial web 8 the tongue 3 rises on the left and the tongue 4 depends on the right, While the anchorage web D rises on the right, and the web 9 depends on the left; and Fig. VI shows the reverse position of the corresponding parts.

Turning to Fig. VII, two brackets of a pair are shown assembled with strips of Wood in frame formation. In the particular instance given, the medial web is 1%; of an inch wide and the anchorage webs are 1%; inches in length. The brackets accordingly are intended for wooden strip 13/16 x 11/2 in section. The strip may be wider, but not thicker. Sections of strip of proper length are cut off square and assembled as shown.

One section 6 is tted butt end against the medial Y web, with edge ush with edge b g of an anchorage web 9, and with the opposite tongue 4 resting against its broader face. The brace web l2 also overlaps this broader face so that the adjacent nail holes overlie the section. Nails are driven through the nail holes of the medial web, anchorage web, tongue, and brace web. The section 'I is then applied between the upstanding webs of the bracket and brought to position, snug upon the medial web and flush at its end with the narrow face of section '6, and it in turn is secured by nails. The opposite corner is similarly formed, and in such manner a frame may be completed.

There is no mortising-not even a mitre-cut. Square-ended lengths, most simply cut, are assembled and secured. The anchorage is adequate; the brace webs aord rigidity against racking; there are no projecting angles.

I claim as my invention:

l. A corner bracket for a frame, formed of a single piece of sheet metal cut, slitted and bent, and consisting of a medial web with parallel sides,

from which web on one side rise a brace Yweb and a tongue and from which on the other side rises an anchorage web, rwhile from the web on the side first named depends an anchorage web and on the other side depend a brace web and a tongue.

2. A corner bracket for a frame, formed of a single piece of sheet metal cut, slitted and bent, and consisting of a medial web with parallel sides from one side of which complementarily shaped anchorage web and tongue are bent upward and downward anda brace web is bent downward, and from which on the opposite side complementarily shaped anchorage web and tongue are bent downward and upward and a brace web is bent upward.

3. A corner bracket for a frame, formed of a single piece of sheet metal cut, slitted and bent,

and consisting of a medial web with parallel sidesV fromv opposite sides of which two brace webs are Y bent, one downward, the other upward, and from opposite sides of which complementary shaped anchorage webs and tongues are spread, one such complementary part downward, the other upward. 4. A frame formed of strips united at the cor# ners by brackets of claim l, thebrackets of opposite corners alike, and the brackets of adjacent corners being each the reverse of the other in the arrangement of brace webs, anchorage webs and tongues, relatively to the medial web.

ALBERT R. ANDERSON. 

